Microstructure Analysis and Preparation of B2O3-Modified ZrSiO4/SiC Oxidation Resistant Coatings

Wei Hua Kong; Jian Feng Huang; Cui Yan Li; Li Yun Cao; Hai Bo Ouyang; Zhe Bai

doi:10.4028/www.scientific.net/MSF.809-810.642

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HomeMaterials Science ForumMaterials Science Forum Vols. 809-810Microstructure Analysis and Preparation of...

Microstructure Analysis and Preparation of B₂O₃-Modified ZrSiO₄/SiC Oxidation Resistant Coatings

Abstract:

A B₂O₃-modified ZrSiO₄ outer coating was prepared by Pulsed arc Discharge Deposition on the surface of SiC bonding layer coated carbon fiber reinforced carbon (C/C) composites. The phase compositions of the prepared coatings were analyzed by X-ray diffraction (XRD), the morphologies of the multi-layer coatings were observed by scanning electron microscopy (SEM). The influence of pulsed arc discharge deposition electric voltage and time on the phase composition, microstructure of the mixed coatings was particularly investigated. And the invalidation behavior of the as-prepared coating coated samples at 1273K was analyzed. XRD results show that the outer layer of the coating was mainly composed of B₂O₃ and ZrSiO₄ phase. When the deposition electric voltage was 400V, single deposition time was 8 min, total time was 32min, the structure and thickness of the outer layer was compact and uniform. The coating prepared at optimal technological conditions could effectively protect C/C composites from oxidation at 1273K in air for 600min with a weight loss of 4.063%. The failure of the coating at intermediate temperature is due to the generation of some cross-cracks in the coating and sectional volatilization of B₂O₃.

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Materials Science Forum (Volumes 809-810)

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642-648

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.809-810.642

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Online since:

December 2014

Authors:

Wei Hua Kong, Jian Feng Huang*, Cui Yan Li, Li Yun Cao, Hai Bo Ouyang, Zhe Bai

Keywords:

Boron Oxide, Carbon/Carbon Composites, Deposition Electric Voltage, Deposition Time, Oxidation, Pulsed Arc Discharge Deposition, Zirconium Silicate

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